<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <!-- 每一条数据 -->
        <ul class="cart-list" v-for="data in cartList" :key="data.id">
          <!-- 是否勾选 -->
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="data.isChecked == 1"
              @change="changeGoodsSelect($event, data)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="data.imgUrl" />
            <div class="item-msg">
              {{ data.skuName }}
            </div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ data.skuPrice }}</span>
          </li>
          <!-- 商品数量 -->
          <li class="cart-list-con5">
            <a
              href="javascript:void(0)"
              class="mins"
              @click="
                if (data.skuNum - 1 >= 1) {
                  numchange(-1, data)
                }
              "
              >-</a
            >
            <input
              autocomplete="off"
              type="text"
              minnum="1"
              class="itxt"
              :value="data.skuNum"
              @change="goodsNumChange($event, data)"
            />
            <a
              href="javascript:void(0)"
              class="plus"
              @click="numchange(1, data)"
              >+</a
            >
          </li>
          <!-- 小计（元） -->
          <li class="cart-list-con6">
            <span class="sum">{{ data.skuNum * data.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="delGoods(data, cartList)">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <!-- 购物车操作 -->
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" @change="checkAll" />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="delGoodsAll">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ totalCheckedNumAndPrice.checkedNum }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalCheckedNumAndPrice.sum }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapState } from 'vuex'
import {
  reqChangeGoodsSelect,
  reqAddOrChangeShop,
  reqDelGoodsFromShopcart
} from '@/api'
export default {
  name: 'ShopCart',
  data() {
    return {}
  },
  computed: {
    ...mapState({
      cartList: (state) => {
        if (state.shopcart.cartList[0])
          return state.shopcart.cartList[0].cartInfoList || []
        else return []
      }
    }),
    //购物车中已经确定勾选商品的总价
    totalCheckedNumAndPrice() {
      let sum = 0
      let checkedNum = 0
      this.cartList.forEach((item) => {
        if (item.isChecked == 1) {
          sum += item.skuNum * item.skuPrice
          checkedNum++
        }
      })
      return { checkedNum, sum }
    }
  },
  methods: {
    // 文本框修改商品数量
    async goodsNumChange(event, data) {
      let num = event.target.value * 1
      if (isNaN(num) || num < 1) {
        num = 1
      } else {
        num = parseInt(num)
      }
      // 接口参数要求 : 正数代表增加,负数代表减少
      debugger
      let needNum = num - data.skuNum
      let result = await reqAddOrChangeShop(data.skuId, needNum)
      if (result.code == 200) {
        data.skuNum = num
      }
    },
    // 改变商品选中状态
    async changeGoodsSelect(event, data) {
      let dom = event.target
      let result = await reqChangeGoodsSelect(
        data.skuId,
        dom.checked ? '1' : '0'
      )
      if (result.code != 200) {
        alert(result.message)
        dom.checked = !dom.checked
      } else {
        // 服务器数据改变了,本地也要改变,其他计算值才准确(如 totalCheckedNumAndPrice)
        data.isChecked = dom.checked ? 1 : 0
        // console.log('改变成功')
      }
    },
    //全选,取消全选
    checkAll(event) {
      let isChecked = event.target.checked
      this.cartList.forEach(async (item) => {
        // 不一致的才修改
        if (item.isChecked == isChecked ? 0 : 1) {
          // 向服务器发请求修改,接口要求是字符串 '1' '0'
          let result = await reqChangeGoodsSelect(
            item.skuId,
            isChecked ? '1' : '0'
          )
          if (result.code == 200) {
            // 服务器修改成功,再修改本地数据
            item.isChecked = isChecked ? 1 : 0
          } else {
            alert(result.message)
          }
        }
      })
    },
    // 修改商品购买数量
    async numchange(num, data) {
      let goodsNum = data.skuNum
      // 向服务器发请求修改
      if (goodsNum + num >= 1) {
        // 接口参数要求 : 正数代表增加,负数代表减少
        let result = await reqAddOrChangeShop(data.skuId, num)
        if (result.code == 200) {
          data.skuNum += num
        }
      }
    },
    // 删除选中的商品
    async delGoods(data, list) {
      // 发起请求
      let result = await reqDelGoodsFromShopcart(data.skuId)
      if (result.code == 200) {
        // 修改本地
        list.splice(list.indexOf(data), 1)
      } else {
        alert(result.message)
      }
    },
    delGoodsAll() {
      this.cartList.forEach(async (item) => {
        if (item.isChecked == 1) {
          // 注意同步
          await this.delGoods(item, this.cartList)
        }
      })
    }
  },
  created() {
    this.$store.dispatch('getCartList')
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }
        // 15  35  10 17 10 13
        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: 'Microsoft YaHei';
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>
